Understanding Multi-Peak Anomalies for Unexploded Ordnance Discrimination
department or school: Science, Faculty of
department or school: Earth and Ocean Sciences, Department of
data provider: DSpace
degree campus: UBCV
identifier citation: Kushnir, Alexandra R.L. 2008. Understanding Multi-Peak Anomalies for Unexploded Ordnance Discrimination. Undergraduate Honours Thesis. Department of Earth and Ocean Sciences. University of British Columbia.
rights copyright: Kushnir, Alexandra R. L.
creator: Kushnir, Alexandra R. L.
issued: 2008-07-23T21:26:20Z
issued: 2008-07-23
description: A workflow for the discrimination of multi-peak anomalies due to an unexploded ordnance (UXO) is presented. The effects of changes in the depth and orientation of a subsurface target on its TEM response are explored. Further, the variation of the peak separation, peak widths, maxima to minimum ratios and maxima values through time are modelled. Models of spatial and temporal variations are performed for both one and twotargets. These models are devoid of noise and focus primarily on the 3lb FLBGR bomb. It is found that the decay of the magnitudes of the anomaly maxima are related to the decay of the characteristic polarization curves of the UXO that creates them. The behaviour of the decay of the magnitudes of the maxima values of multi-peak anomalies is determined to be a good indication of target number in the subsurface. Observing these decays, it is possible to distinguish between two multi-peak scenarios, namely: a) a multipeak anomaly produced by a single UXO or two UXOs of the same type; and b) a multipeak anomaly produced by two UXOs of different types.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/1113
extent: 8760412 bytes
format: application/pdf
note: Understanding Multi-Peak Anomalies for Unexploded Ordnance Discrimination by Alexandra Roma Larisa Kushnir A THESIS SUBMITED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF BACHELORS OF SCIENCE (HONOURS) in THE FACULTY OF SCIENCE Department of Earth and Ocean Sciences This thesis conforms to the required standard ……………………………….. Supervisor THE UNIVERSITY OF BRITISH COLUMBIA MARCH 2008 2 Abstract A workflow for the discrimination of multi-peak anomalies due to an unexploded ordnance (UXO) is presented. The effects of changes in the depth and orientation of a subsurface target on its TEM response are explored. Further, the variation of the peak separation, peak widths, maxima to minimum ratios and maxima values through time are modelled. Models of spatial and temporal variations are performed for both one and two- targets. These models are devoid of noise and focus primarily on the 3lb FLBGR bomb. It is found that the decay of the magnitudes of the anomaly maxima are related to the decay of the characteristic polarization curves of the UXO that creates them. The behaviour of the decay of the magnitudes of the maxima values of multi-peak anomalies is determined to be a good indication of target number in the subsurface. Observing these decays, it is possible to distinguish between two multi-peak scenarios, namely: a) a multi- peak anomaly produced by a single UXO or two UXOs of the same type; and b) a multi- peak anomaly produced by two UXOs of different types. 3 Table of Contents Abstract .......................................................................................................................... i Table of Figures............................................................................................................ iv Acknowledgments ........................................................................................................vi Chapter 1: Introduction..............................................................................…
has type: Graduating Project
is shown at: 10.14288/1.0053577
language: eng
peer review status: Unreviewed
provider: Vancouver : University of British Columbia Library
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Undergraduate
is part of: University of British Columbia. EOSC 449
subject: UXO
subject: multi-peak anomalies
subject: Time-domain electromagnetic
subject: TEM
subject: two dipole approximation
subject: polarization
subject: depth
subject: orientation
type: Text
identifier URI: http://hdl.handle.net/2429/1113